Composition of matter suitable for bucking.



UNITED STATES PATENT OFFICE.

RENE BOHN, OF MANNHEIM, (S'rIERlVIANY, ASSIGNOR TO BADISCHE ANILIN '&SODA FABBIK, 0F LUDWIGSHAFEN-ON-TI-IE-RHINE, GERMANY, A CORPORATION.

COMPOSITION OF MATTER SUITABLE FOR BUCKING.

No Drawing.

T 0 all whom it may concern:

Be it known that I, RENE BoHN, doctor of philosophy and chemist, citizenof the Swiss Republic, residing at Mannheim, Germany, have invented newand useful Improvements in Compositions of Matter Suitable for Bucking,of which the following is a specification.

Few, if any, coloring matters, when dyed or printed on vegetable fiber,are perfectly fast against bucking (that is, heating for a considerabletime with dilute caustic alkali solution), particularly when the buckingis carried out under pressure. Attempts have been made to avoid thisdisadvantage of bucking by adding an inorganic oxidizing agent, such forinstance as sodium bichromate and potassium permanganate, to the bathused. isfactory because when bichromate is used, the chromium oxid whichis formed colors the material yellow, and also when permanganate isused. the material is stained and the removal of such stains is acomplicated process and tends to weaken the fiber.

I have discovered a new composition of matter which, when used insolution in water in a bucking bath, does not afiect the coloringmatters in the manner described, that is to say, the material dyed orprinted with vat coloring matter can be successfully bucked without thecolor passing into the white or spreading beyond its proper limits.

My new composition of matter consists of a mixture of an alkali salt ofnitrobenzenemonosulfonic acid and alkali. The alkali used may be causticor carbonate or a salt possessing an alkaline reaction, like sodiumphosphate or borax, or again mixtures of these alkalis can be used withor'without water. \Vater would be added in cases where it is desired tohave my new bucking mixture in solution so that it is immediately readyfor use or merely requires further dilution with water in order toprepare the bucking bath, but as a rule in commerce for saving freightand the like the solid mix- Speeification of Letters Patent.

parts of water.

These, however, are not sat-' Patented May 5, 1914.

Application filed January 27, 1909. Serial N 0. 474,485.

ture will be preferred. I regard nitroben- Zene sulfonic acid andnitro-toluene sulfonic acid as equivalent to one another.

My new composition may consist, for instance, of the followingingredients in approximately the proportion stated, namely,

solid caustic soda thirteen parts, the sodiumsalt of nitrobenzenesulfonic acid eight parts. If desired, sullicient water may be added ineach case to produce a paste or solution, and in order to use my newcomposition as a bucking vat, the materials mentioned in the foregoingexample are simply dissolved in or mixed with four thousand isintroduced into this bath and boiled for about two hours at a pressureof one atmosphere in excess'of ordinary pressure.

.In this application I do not claim the process of bucking with amixture containing an alkali salt of nitrobenzene-monosulfonic acid andalkali, since this process is claimed in the divisional applicationSerial No. 799,4.8i.

Now what I claim is 1. The hereinbefore described composition of mattercomprising an alkali salt of nitrobenzene-mono-sulfonic acid and alkali.

2. Thehereinbefore described .composition of matter consisting of thesodium salt of nitrobenzene-monosulfonic acid, alkali and Water.

3. The composition of matter comprising 13 parts of caustic soda and 8parts of the soddium salt of nitrobenzene-monosulfonic aci 4. Thecomposition of matter consisting of 13 parts of caustic soda, 8 parts ofthe sodium salt of nitrobenzene-monosulfonic acid and Water.

. In testimony whereof I have hereunto set my hand in the presence oftwo subscribing witnesses.

RENE BOHN. Witnesses:

J. Auto. LLOYD, SEREsoR CATHERAM.

The material to be bucked

